where the intersection of their convergent region is \(|m_{_2}^2/p^2|\le 1\) .
These two linearly independent Gaussian functions constitute the fundamental
solution system of the GKZ-system of Eq.(REF ) in the region \(|m_{_2}^2/p^2|\le 1\) 
which is consistent with the results in the literature. Choosing \(y_{_i}=0\)  in Eq.(45)
of Ref. [1]}, the fourth type Appell functions of the second and the fourth terms
are reduced as the Gauss functions above.
